Am I Overreacting by Kicking Out My Husband After Catching Him Cheating with My Best Friend?

Am I Overreacting by Kicking Out My Husband After Catching Him Cheating with My Best Friend?

I (37F) have been married to my husband James (fake name) (34M) for 7 years. Six years ago, I made a huge mistake - I had a one-night stand while we were going through a rough patch. I came clean to James about it immediately after, and we worked through it with therapy because I wanted to save our marriage. It never happened again, and I thought we had moved past it.

Enter last Saturday, which was supposed to be just another typical weekend. Jack said he was going out with some work buddies, and my best friend, Sarah (fake name) (41F), was supposedly at a family reunion out of town. I decided to surprise James at what I thought was his hangout spot, but he wasn't there. On a hunch, I went by our house, thinking maybe he decided to come back early or changed plans.

What I walked into was a scene straight out of a bad movie. There was James, in our bedroom, with Sarah. Clothes were scattered, the atmosphere was unmistakable. I was absolutely devastated. They didn't even notice me at first because they were so caught up in the moment.

I screamed, they jumped apart, and both started with the usual "it's not what it looks like" and "we can explain" but I was having none of it. I told James to get out, and Sarah to never contact me again. James tried to plead, saying it was a one-time thing, but after my own experience, I know where that leads. I've packed his stuff and told him to stay with his parents for now.

Here's where I'm torn. My sister thinks I should try to work it out, reminding me of my past mistake and how James forgave me. But seeing them together like that, my trust in both my husband and my best friend is completely shattered.

Am I overreacting by not giving James another chance and cutting Sarah out of my life completely? Should I be considering reconciliation, or is my reaction justified given the circumstances?

Edit for clarity: No, there were no signs I was aware of before this incident. Both Jack and Sarah had been acting completely normal around me.